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1 ;;; lisp.el --- Lisp editing commands for XEmacs
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2
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3 ;; Copyright (C) 1985, 1986, 1994 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: lisp, languages
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;;; Commentary:
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27
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28 ;; Lisp editing commands to go with Lisp major mode.
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29
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30 ;;; Code:
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31
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32 ;; Note that this variable is used by non-lisp modes too.
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33 (defvar defun-prompt-regexp nil
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34 "*Non-nil => regexp to ignore, before the character that starts a defun.
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35 This is only necessary if the opening paren or brace is not in column 0.
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36 See `beginning-of-defun'.")
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37 (make-variable-buffer-local 'defun-prompt-regexp)
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38
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39 (defvar parens-require-spaces t
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40 "Non-nil => `insert-parentheses' should insert whitespace as needed.")
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41
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42 (defun forward-sexp (&optional arg)
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43 "Move forward across one balanced expression (sexp).
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44 With argument, do it that many times.
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45 Negative arg -N means move backward across N balanced expressions."
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46 (interactive "_p")
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47 (or arg (setq arg 1))
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48 ;; #### evil hack! The other half of the evil hack below.
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49 (if (and (> arg 0) (looking-at "#s("))
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50 (goto-char (+ (point) 2)))
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51 (goto-char (or (scan-sexps (point) arg) (buffer-end arg)))
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52 (if (< arg 0) (backward-prefix-chars))
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53 ;; #### evil hack! Skip back over #s so that structures are read properly.
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54 ;; the current cheesified syntax tables just aren't up to this.
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55 (if (and (< arg 0)
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56 (eq (char-after (point)) ?\()
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57 (>= (- (point) (point-min)) 2)
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58 (eq (char-after (- (point) 1)) ?s)
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59 (eq (char-after (- (point) 2)) ?#))
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60 (goto-char (- (point) 2))))
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61
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62 (defun backward-sexp (&optional arg)
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63 "Move backward across one balanced expression (sexp).
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64 With argument, do it that many times.
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65 Negative arg -N means move forward across N balanced expressions."
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66 (interactive "_p")
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67 (or arg (setq arg 1))
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68 (forward-sexp (- arg)))
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69
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70 (defun mark-sexp (arg)
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71 "Set mark ARG sexps from point.
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72 The place mark goes is the same place \\[forward-sexp] would move to
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73 with the same argument.
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74 Repeat this command to mark more sexps in the same direction."
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75 (interactive "p")
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76 (mark-something 'mark-sexp 'forward-sexp arg))
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77
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78 (defun forward-list (&optional arg)
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79 "Move forward across one balanced group of parentheses.
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80 With argument, do it that many times.
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81 Negative arg -N means move backward across N groups of parentheses."
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82 (interactive "_p")
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83 (or arg (setq arg 1))
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84 (goto-char (or (scan-lists (point) arg 0) (buffer-end arg))))
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85
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86 (defun backward-list (&optional arg)
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87 "Move backward across one balanced group of parentheses.
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88 With argument, do it that many times.
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89 Negative arg -N means move forward across N groups of parentheses."
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90 (interactive "_p")
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91 (or arg (setq arg 1))
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92 (forward-list (- arg)))
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93
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94 (defun down-list (arg)
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95 "Move forward down one level of parentheses.
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96 With argument, do this that many times.
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97 A negative argument means move backward but still go down a level.
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98 In Lisp programs, an argument is required."
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99 (interactive "_p")
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100 (let ((inc (if (> arg 0) 1 -1)))
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101 (while (/= arg 0)
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102 (goto-char (or (scan-lists (point) inc -1) (buffer-end arg)))
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103 (setq arg (- arg inc)))))
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104
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105 (defun backward-up-list (arg)
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106 "Move backward out of one level of parentheses.
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107 With argument, do this that many times.
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108 A negative argument means move forward but still to a less deep spot.
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109 In Lisp programs, an argument is required."
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110 (interactive "p")
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111 (up-list (- arg)))
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112
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113 (defun up-list (arg)
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114 "Move forward out of one level of parentheses.
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115 With argument, do this that many times.
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116 A negative argument means move backward but still to a less deep spot.
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117 In Lisp programs, an argument is required."
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118 (interactive "_p")
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119 (let ((inc (if (> arg 0) 1 -1)))
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120 (while (/= arg 0)
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121 (goto-char (or (scan-lists (point) inc 1) (buffer-end arg)))
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122 (setq arg (- arg inc)))))
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123
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124 (defun kill-sexp (arg)
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125 "Kill the sexp (balanced expression) following the cursor.
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126 With argument, kill that many sexps after the cursor.
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127 Negative arg -N means kill N sexps before the cursor."
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128 (interactive "p")
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129 (let ((opoint (point)))
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130 (forward-sexp arg)
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131 (kill-region opoint (point))))
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132
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133 (defun backward-kill-sexp (arg)
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134 "Kill the sexp (balanced expression) preceding the cursor.
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135 With argument, kill that many sexps before the cursor.
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136 Negative arg -N means kill N sexps after the cursor."
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137 (interactive "p")
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138 (kill-sexp (- arg)))
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139
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140 (defun beginning-of-defun (&optional arg)
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141 "Move backward to the beginning of a defun.
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142 With argument, do it that many times. Negative arg -N
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143 means move forward to Nth following beginning of defun.
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144 Returns t unless search stops due to beginning or end of buffer.
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145
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146 Normally a defun starts when there is an char with open-parenthesis
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147 syntax at the beginning of a line. If `defun-prompt-regexp' is
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148 non-nil, then a string which matches that regexp may precede the
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149 open-parenthesis, and point ends up at the beginning of the line."
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150 (interactive "_p")
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151 (and (beginning-of-defun-raw arg)
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152 (progn (beginning-of-line) t)))
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153
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154 (defun beginning-of-defun-raw (&optional arg)
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155 "Move point to the character that starts a defun.
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156 This is identical to beginning-of-defun, except that point does not move
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157 to the beginning of the line when `defun-prompt-regexp' is non-nil."
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158 (interactive "p")
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159 (and arg (< arg 0) (not (eobp)) (forward-char 1))
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160 (and (re-search-backward (if defun-prompt-regexp
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161 (concat "^\\s(\\|"
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162 "\\(" defun-prompt-regexp "\\)\\s(")
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163 "^\\s(")
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164 nil 'move (or arg 1))
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165 (progn (goto-char (1- (match-end 0)))) t))
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166
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167 (defun buffer-end (arg &optional buffer)
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168 "Return `point-max' of BUFFER if ARG is > 0; return `point-min' otherwise.
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169 BUFFER defaults to the current buffer if omitted."
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170 (if (> arg 0) (point-max buffer) (point-min buffer)))
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171
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172 (defun end-of-defun (&optional arg)
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173 "Move forward to next end of defun. With argument, do it that many times.
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174 Negative argument -N means move back to Nth preceding end of defun.
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175
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176 An end of a defun occurs right after the close-parenthesis that matches
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177 the open-parenthesis that starts a defun; see `beginning-of-defun'."
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178 (interactive "_p")
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179 (if (or (null arg) (= arg 0)) (setq arg 1))
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180 (let ((first t))
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181 (while (and (> arg 0) (< (point) (point-max)))
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182 (let ((pos (point)))
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183 (while (progn
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184 (if (and first
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185 (progn
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186 (end-of-line 1)
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187 (beginning-of-defun-raw 1)))
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188 nil
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189 (or (bobp) (forward-char -1))
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190 (beginning-of-defun-raw -1))
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191 (setq first nil)
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192 (forward-list 1)
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193 (skip-chars-forward " \t")
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194 (if (looking-at "\\s<\\|\n")
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195 (forward-line 1))
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196 (<= (point) pos))))
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197 (setq arg (1- arg)))
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198 (while (< arg 0)
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199 (let ((pos (point)))
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200 (beginning-of-defun-raw 1)
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201 (forward-sexp 1)
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202 (forward-line 1)
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203 (if (>= (point) pos)
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204 (if (beginning-of-defun-raw 2)
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205 (progn
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206 (forward-list 1)
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207 (skip-chars-forward " \t")
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208 (if (looking-at "\\s<\\|\n")
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209 (forward-line 1)))
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210 (goto-char (point-min)))))
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211 (setq arg (1+ arg)))))
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212
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213 (defun mark-defun ()
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214 "Put mark at end of this defun, point at beginning.
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215 The defun marked is the one that contains point or follows point."
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216 (interactive)
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217 (push-mark (point))
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218 (end-of-defun)
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219 (push-mark (point) nil t)
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220 (beginning-of-defun)
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221 (re-search-backward "^\n" (- (point) 1) t))
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222
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223 (defun insert-parentheses (arg)
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224 "Put parentheses around next ARG sexps. Leave point after open-paren.
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225 No argument is equivalent to zero: just insert `()' and leave point between.
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226 If `parens-require-spaces' is non-nil, this command also inserts a space
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227 before and after, depending on the surrounding characters."
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228 (interactive "P")
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229 (if arg (setq arg (prefix-numeric-value arg))
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230 (setq arg 0))
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231 (or (eq arg 0) (skip-chars-forward " \t"))
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232 (and parens-require-spaces
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233 (not (bobp))
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234 (memq (char-syntax (preceding-char)) '(?w ?_ ?\) ))
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235 (insert " "))
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236 (insert ?\()
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237 (save-excursion
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238 (or (eq arg 0) (forward-sexp arg))
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239 (insert ?\))
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240 (and parens-require-spaces
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241 (not (eobp))
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242 (memq (char-syntax (following-char)) '(?w ?_ ?\( ))
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243 (insert " "))))
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244
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245 (defun move-past-close-and-reindent ()
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246 "Move past next `)', delete indentation before it, then indent after it."
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247 (interactive)
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248 (up-list 1)
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249 (forward-char -1)
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250 (while (save-excursion ; this is my contribution
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251 (let ((before-paren (point)))
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252 (back-to-indentation)
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253 (= (point) before-paren)))
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254 (delete-indentation))
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255 (forward-char 1)
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256 (newline-and-indent))
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257
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258 (defun lisp-complete-symbol ()
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259 "Perform completion on Lisp symbol preceding point.
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260 That symbol is compared against the symbols that exist
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261 and any additional characters determined by what is there
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262 are inserted.
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263 If the symbol starts just after an open-parenthesis,
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264 only symbols with function definitions are considered.
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265 Otherwise, all symbols with function definitions, values
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266 or properties are considered."
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267 (interactive)
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268 (let* ((end (point))
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269 (buffer-syntax (syntax-table))
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270 (beg (unwind-protect
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271 (save-excursion
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272 (if emacs-lisp-mode-syntax-table
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273 (set-syntax-table emacs-lisp-mode-syntax-table))
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274 (backward-sexp 1)
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275 (while (= (char-syntax (following-char)) ?\')
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276 (forward-char 1))
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277 (point))
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278 (set-syntax-table buffer-syntax)))
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279 (pattern (buffer-substring beg end))
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280 (predicate
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281 (if (eq (char-after (1- beg)) ?\()
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282 'fboundp
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283 #'(lambda (sym)
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284 (or (boundp sym) (fboundp sym)
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285 (symbol-plist sym)))))
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286 (completion (try-completion pattern obarray predicate)))
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287 (cond ((eq completion t))
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288 ((null completion)
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289 (message "Can't find completion for \"%s\"" pattern)
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290 (ding))
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291 ((not (string= pattern completion))
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292 (delete-region beg end)
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293 (insert completion))
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294 (t
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295 (message "Making completion list...")
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296 (let ((list (all-completions pattern obarray predicate))
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297 ;FSFmacs crock unnecessary in XEmacs
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298 ;see minibuf.el
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299 ;(completion-fixup-function
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300 ; #'(lambda () (if (save-excursion
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301 ; (goto-char (max (point-min)
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302 ; (- (point) 4)))
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303 ; (looking-at " <f>"))
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304 ; (forward-char -4))))
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305 )
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306 (or (eq predicate 'fboundp)
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307 (let (new)
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308 (while list
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309 (setq new (cons (if (fboundp (intern (car list)))
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310 (list (car list) " <f>")
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311 (car list))
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312 new))
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313 (setq list (cdr list)))
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314 (setq list (nreverse new))))
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315 (with-output-to-temp-buffer "*Completions*"
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316 (display-completion-list list)))
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317 (message "Making completion list...done")))))
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318
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319 ;;; lisp.el ends here
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